We used a Milton one but it had gel. It worked great.
However, just a heads up, when I sent off for the ants it took MONTHS to get them. Something about they can't mail it in hot weather. Maybe now it's getting cool enough more consistently? But I had to totally give up the idea of waiting on the ants...so we just rowed it and then a few months later had some cool ants to look at.
Wife to David, Mommy to Hannah (9), Emily (8) & Caleb (6)
Let Your unfailing love rest upon us, O Lord, even as we put our hope in You! Psalm 33:22